Italian Buckthorn - introduced (*Rhamnus alaternus)

Occurrence: The seed is spread by birds, and this weed is usually
found at the base of trees, growing near gardens which have
buckthorn planted. It is a common weed near the Castlemaine Botanic Gardens.

Identification:

it is an evergreen shrub or small tree

the leaves are a glossy green

the leaves are slightly toothed

the flowers are small and greenish yellow

the fruit are pea-sized, and red at first, turning to black when ripe.